added background hover to the teacher and student view of the overview page
added background hover on student classroom view
added logo
started playing with new colors
added the new color scheme to the whole(?) site
edited styling on nav bar
Created self.find_submission_and_status assignment model method

Moved logic relating to finding a student user's submission and that submission's status. Returns the completed submission. If none exists then @completed_submission is nil.
added 'due' next to all the due dates
Created Assignment.create_submission_data

Moved controller logic for submission and submission placeholder creation into Assignment model. Logic is held in self.create_submission_data which returns a hash containing the submission object and the submission title and content placeholders respectively. Placeholders will populate the editor if the submission has not been marked complete.
Refactored Assignment model's self.find_submission_and_status method

No change in functionality, but the refactored version is more readable and clean.
updated seed data so there is only one teacher per classroom
refactored the dashboard for student and teacher
refactored teacher classroom view
refactored student classroom view
Merge branch 'master' into css2

added styling and refactoring of views
merging with master
fixed test for assignment update
Merge pull request #61 from whoisglover/css2

Do you want nice styling?
updated views with feedback
Refactored Assignment model's self.create_submission_data method

Also made some small changes self.find_submission_and_status for readability and Ruby convention.